The Tcpdump Group git mirrors - tcpdump/blob - print-dccp.c

   1 /*
   2  * Copyright (C) Arnaldo Carvalho de Melo 2004
   3  * Copyright (C) Ian McDonald 2005
   4  * Copyright (C) Yoshifumi Nishida 2005
   5  *
   6  * This software may be distributed either under the terms of the
   7  * BSD-style license that accompanies tcpdump or the GNU GPL version 2
   8  */
   9
  10 #define NETDISSECT_REWORKED
  11 #ifdef HAVE_CONFIG_H
  12 #include "config.h"
  13 #endif
  14
  15 #include <tcpdump-stdinc.h>
  16
  17 #include <stdio.h>
  18 #include <string.h>
  19
  20 #include "interface.h"
  21 #include "addrtoname.h"
  22 #include "extract.h"                    /* must come after interface.h */
  23 #include "ip.h"
  24 #ifdef INET6
  25 #include "ip6.h"
  26 #endif
  27 #include "ipproto.h"
  28
  29 /**
  30  * struct dccp_hdr - generic part of DCCP packet header, with a 24-bit
  31  * sequence number
  32  *
  33  * @dccph_sport - Relevant port on the endpoint that sent this packet
  34  * @dccph_dport - Relevant port on the other endpoint
  35  * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
  36  * @dccph_ccval - Used by the HC-Sender CCID
  37  * @dccph_cscov - Parts of the packet that are covered by the Checksum field
  38  * @dccph_checksum - Internet checksum, depends on dccph_cscov
  39  * @dccph_x - 0 = 24 bit sequence number, 1 = 48
  40  * @dccph_type - packet type, see DCCP_PKT_ prefixed macros
  41  * @dccph_seq - 24-bit sequence number
  42  */
  43 struct dccp_hdr {
  44         uint16_t        dccph_sport,
  45                         dccph_dport;
  46         uint8_t         dccph_doff;
  47         uint8_t         dccph_ccval_cscov;
  48         uint16_t        dccph_checksum;
  49         uint8_t         dccph_xtr;
  50         uint8_t         dccph_seq[3];
  51 } UNALIGNED;
  52
  53 /**
  54  * struct dccp_hdr_ext - generic part of DCCP packet header, with a 48-bit
  55  * sequence number
  56  *
  57  * @dccph_sport - Relevant port on the endpoint that sent this packet
  58  * @dccph_dport - Relevant port on the other endpoint
  59  * @dccph_doff - Data Offset from the start of the DCCP header, in 32-bit words
  60  * @dccph_ccval - Used by the HC-Sender CCID
  61  * @dccph_cscov - Parts of the packet that are covered by the Checksum field
  62  * @dccph_checksum - Internet checksum, depends on dccph_cscov
  63  * @dccph_x - 0 = 24 bit sequence number, 1 = 48
  64  * @dccph_type - packet type, see DCCP_PKT_ prefixed macros
  65  * @dccph_seq - 48-bit sequence number
  66  */
  67 struct dccp_hdr_ext {
  68         uint16_t        dccph_sport,
  69                         dccph_dport;
  70         uint8_t         dccph_doff;
  71         uint8_t         dccph_ccval_cscov;
  72         uint16_t        dccph_checksum;
  73         uint8_t         dccph_xtr;
  74         uint8_t         reserved;
  75         uint8_t         dccph_seq[6];
  76 } UNALIGNED;
  77
  78 #define DCCPH_CCVAL(dh) (((dh)->dccph_ccval_cscov >> 4) & 0xF)
  79 #define DCCPH_CSCOV(dh) (((dh)->dccph_ccval_cscov) & 0xF)
  80
  81 #define DCCPH_X(dh)     ((dh)->dccph_xtr & 1)
  82 #define DCCPH_TYPE(dh)  (((dh)->dccph_xtr >> 1) & 0xF)
  83
  84 /**
  85  * struct dccp_hdr_request - Conection initiation request header
  86  *
  87  * @dccph_req_service - Service to which the client app wants to connect
  88  */
  89 struct dccp_hdr_request {
  90         uint32_t        dccph_req_service;
  91 } UNALIGNED;
  92
  93 /**
  94  * struct dccp_hdr_response - Conection initiation response header
  95  *
  96  * @dccph_resp_ack - 48 bit ack number, contains GSR
  97  * @dccph_resp_service - Echoes the Service Code on a received DCCP-Request
  98  */
  99 struct dccp_hdr_response {
 100         uint8_t                         dccph_resp_ack[8];      /* always 8 bytes */
 101         uint32_t                        dccph_resp_service;
 102 } UNALIGNED;
 103
 104 /**
 105  * struct dccp_hdr_reset - Unconditionally shut down a connection
 106  *
 107  * @dccph_resp_ack - 48 bit ack number
 108  * @dccph_reset_service - Echoes the Service Code on a received DCCP-Request
 109  */
 110 struct dccp_hdr_reset {
 111         uint8_t                         dccph_reset_ack[8];     /* always 8 bytes */
 112         uint8_t                         dccph_reset_code,
 113                                         dccph_reset_data[3];
 114 } UNALIGNED;
 115
 116 enum dccp_pkt_type {
 117         DCCP_PKT_REQUEST = 0,
 118         DCCP_PKT_RESPONSE,
 119         DCCP_PKT_DATA,
 120         DCCP_PKT_ACK,
 121         DCCP_PKT_DATAACK,
 122         DCCP_PKT_CLOSEREQ,
 123         DCCP_PKT_CLOSE,
 124         DCCP_PKT_RESET,
 125         DCCP_PKT_SYNC,
 126         DCCP_PKT_SYNCACK,
 127         DCCP_PKT_INVALID
 128 };
 129
 130 enum dccp_reset_codes {
 131         DCCP_RESET_CODE_UNSPECIFIED = 0,
 132         DCCP_RESET_CODE_CLOSED,
 133         DCCP_RESET_CODE_ABORTED,
 134         DCCP_RESET_CODE_NO_CONNECTION,
 135         DCCP_RESET_CODE_PACKET_ERROR,
 136         DCCP_RESET_CODE_OPTION_ERROR,
 137         DCCP_RESET_CODE_MANDATORY_ERROR,
 138         DCCP_RESET_CODE_CONNECTION_REFUSED,
 139         DCCP_RESET_CODE_BAD_SERVICE_CODE,
 140         DCCP_RESET_CODE_TOO_BUSY,
 141         DCCP_RESET_CODE_BAD_INIT_COOKIE,
 142         DCCP_RESET_CODE_AGGRESSION_PENALTY,
 143         __DCCP_RESET_CODE_LAST
 144 };
 145
 146 static const char tstr[] = "[|dccp]";
 147
 148 static const char *dccp_reset_codes[] = {
 149         "unspecified",
 150         "closed",
 151         "aborted",
 152         "no_connection",
 153         "packet_error",
 154         "option_error",
 155         "mandatory_error",
 156         "connection_refused",
 157         "bad_service_code",
 158         "too_busy",
 159         "bad_init_cookie",
 160         "aggression_penalty",
 161 };
 162
 163 static const char *dccp_feature_nums[] = {
 164         "reserved",
 165         "ccid",
 166         "allow_short_seqno",
 167         "sequence_window",
 168         "ecn_incapable",
 169         "ack_ratio",
 170         "send_ack_vector",
 171         "send_ndp_count",
 172         "minimum checksum coverage",
 173         "check data checksum",
 174 };
 175
 176 static inline u_int dccp_csum_coverage(const struct dccp_hdr* dh, u_int len)
 177 {
 178         u_int cov;
 179
 180         if (DCCPH_CSCOV(dh) == 0)
 181                 return len;
 182         cov = (dh->dccph_doff + DCCPH_CSCOV(dh) - 1) * sizeof(uint32_t);
 183         return (cov > len)? len : cov;
 184 }
 185
 186 static int dccp_cksum(netdissect_options *ndo, const struct ip *ip,
 187         const struct dccp_hdr *dh, u_int len)
 188 {
 189         return nextproto4_cksum(ndo, ip, (const uint8_t *)(void *)dh, len,
 190                                 dccp_csum_coverage(dh, len), IPPROTO_DCCP);
 191 }
 192
 193 #ifdef INET6
 194 static int dccp6_cksum(const struct ip6_hdr *ip6, const struct dccp_hdr *dh, u_int len)
 195 {
 196         return nextproto6_cksum(ip6, (const uint8_t *)(void *)dh, len,
 197                                 dccp_csum_coverage(dh, len), IPPROTO_DCCP);
 198 }
 199 #endif
 200
 201 static const char *dccp_reset_code(uint8_t code)
 202 {
 203         if (code >= __DCCP_RESET_CODE_LAST)
 204                 return "invalid";
 205         return dccp_reset_codes[code];
 206 }
 207
 208 static uint64_t dccp_seqno(const u_char *bp)
 209 {
 210         const struct dccp_hdr *dh = (const struct dccp_hdr *)bp;
 211         uint64_t seqno;
 212
 213         if (DCCPH_X(dh) != 0) {
 214                 const struct dccp_hdr_ext *dhx = (const struct dccp_hdr_ext *)bp;
 215                 seqno = EXTRACT_48BITS(dhx->dccph_seq);
 216         } else {
 217                 seqno = EXTRACT_24BITS(dh->dccph_seq);
 218         }
 219
 220         return seqno;
 221 }
 222
 223 static inline unsigned int dccp_basic_hdr_len(const struct dccp_hdr *dh)
 224 {
 225         return DCCPH_X(dh) ? sizeof(struct dccp_hdr_ext) : sizeof(struct dccp_hdr);
 226 }
 227
 228 static void dccp_print_ack_no(netdissect_options *ndo, const u_char *bp)
 229 {
 230         const struct dccp_hdr *dh = (const struct dccp_hdr *)bp;
 231         const u_char *ackp = bp + dccp_basic_hdr_len(dh);
 232         uint64_t ackno;
 233
 234         if (DCCPH_X(dh) != 0) {
 235                 ND_TCHECK2(*ackp, 8);
 236                 ackno = EXTRACT_48BITS(ackp + 2);
 237         } else {
 238                 ND_TCHECK2(*ackp, 4);
 239                 ackno = EXTRACT_24BITS(ackp + 1);
 240         }
 241
 242         ND_PRINT((ndo, "(ack=%" PRIu64 ") ", ackno));
 243 trunc:
 244         return;
 245 }
 246
 247 static int dccp_print_option(netdissect_options *, const u_char *, u_int);
 248
 249 /**
 250  * dccp_print - show dccp packet
 251  * @bp - beginning of dccp packet
 252  * @data2 - beginning of enclosing
 253  * @len - lenght of ip packet
 254  */
 255 void dccp_print(netdissect_options *ndo, const u_char *bp, const u_char *data2,
 256                 u_int len)
 257 {
 258         const struct dccp_hdr *dh;
 259         const struct ip *ip;
 260 #ifdef INET6
 261         const struct ip6_hdr *ip6;
 262 #endif
 263         const u_char *cp;
 264         u_short sport, dport;
 265         u_int hlen;
 266         u_int fixed_hdrlen;
 267
 268         dh = (const struct dccp_hdr *)bp;
 269
 270         ip = (struct ip *)data2;
 271 #ifdef INET6
 272         if (IP_V(ip) == 6)
 273                 ip6 = (const struct ip6_hdr *)data2;
 274         else
 275                 ip6 = NULL;
 276 #endif /*INET6*/
 277
 278         /* make sure we have enough data to look at the X bit */
 279         cp = (const u_char *)(dh + 1);
 280         if (cp > ndo->ndo_snapend) {
 281                 ND_PRINT((ndo, "[Invalid packet|dccp]"));
 282                 return;
 283         }
 284         if (len < sizeof(struct dccp_hdr)) {
 285                 ND_PRINT((ndo, "truncated-dccp - %u bytes missing!",
 286                              len - (u_int)sizeof(struct dccp_hdr)));
 287                 return;
 288         }
 289
 290         /* get the length of the generic header */
 291         fixed_hdrlen = dccp_basic_hdr_len(dh);
 292         if (len < fixed_hdrlen) {
 293                 ND_PRINT((ndo, "truncated-dccp - %u bytes missing!",
 294                              len - fixed_hdrlen));
 295                 return;
 296         }
 297         ND_TCHECK2(*dh, fixed_hdrlen);
 298
 299         sport = EXTRACT_16BITS(&dh->dccph_sport);
 300         dport = EXTRACT_16BITS(&dh->dccph_dport);
 301         hlen = dh->dccph_doff * 4;
 302
 303 #ifdef INET6
 304         if (ip6) {
 305                 ND_PRINT((ndo, "%s.%d > %s.%d: ",
 306                              ip6addr_string(ndo, &ip6->ip6_src), sport,
 307                              ip6addr_string(ndo, &ip6->ip6_dst), dport));
 308         } else
 309 #endif /*INET6*/
 310         {
 311                 ND_PRINT((ndo, "%s.%d > %s.%d: ",
 312                              ipaddr_string(ndo, &ip->ip_src), sport,
 313                              ipaddr_string(ndo, &ip->ip_dst), dport));
 314         }
 315
 316         if (ndo->ndo_qflag) {
 317                 ND_PRINT((ndo, " %d", len - hlen));
 318                 if (hlen > len) {
 319                         ND_PRINT((ndo, "dccp [bad hdr length %u - too long, > %u]",
 320                             hlen, len));
 321                 }
 322                 return;
 323         }
 324
 325         /* other variables in generic header */
 326         if (ndo->ndo_vflag) {
 327                 ND_PRINT((ndo, "CCVal %d, CsCov %d, ", DCCPH_CCVAL(dh), DCCPH_CSCOV(dh)));
 328         }
 329
 330         /* checksum calculation */
 331         if (ndo->ndo_vflag && ND_TTEST2(bp[0], len)) {
 332                 uint16_t sum = 0, dccp_sum;
 333
 334                 dccp_sum = EXTRACT_16BITS(&dh->dccph_checksum);
 335                 ND_PRINT((ndo, "cksum 0x%04x ", dccp_sum));
 336                 if (IP_V(ip) == 4)
 337                         sum = dccp_cksum(ndo, ip, dh, len);
 338 #ifdef INET6
 339                 else if (IP_V(ip) == 6)
 340                         sum = dccp6_cksum(ip6, dh, len);
 341 #endif
 342                 if (sum != 0)
 343                         ND_PRINT((ndo, "(incorrect -> 0x%04x), ",in_cksum_shouldbe(dccp_sum, sum)));
 344                 else
 345                         ND_PRINT((ndo, "(correct), "));
 346         }
 347
 348         switch (DCCPH_TYPE(dh)) {
 349         case DCCP_PKT_REQUEST: {
 350                 struct dccp_hdr_request *dhr =
 351                         (struct dccp_hdr_request *)(bp + fixed_hdrlen);
 352                 fixed_hdrlen += 4;
 353                 if (len < fixed_hdrlen) {
 354                         ND_PRINT((ndo, "truncated-dccp request - %u bytes missing!",
 355                                      len - fixed_hdrlen));
 356                         return;
 357                 }
 358                 ND_TCHECK(*dhr);
 359                 ND_PRINT((ndo, "request (service=%d) ",
 360                              EXTRACT_32BITS(&dhr->dccph_req_service)));
 361                 break;
 362         }
 363         case DCCP_PKT_RESPONSE: {
 364                 struct dccp_hdr_response *dhr =
 365                         (struct dccp_hdr_response *)(bp + fixed_hdrlen);
 366                 fixed_hdrlen += 12;
 367                 if (len < fixed_hdrlen) {
 368                         ND_PRINT((ndo, "truncated-dccp response - %u bytes missing!",
 369                                      len - fixed_hdrlen));
 370                         return;
 371                 }
 372                 ND_TCHECK(*dhr);
 373                 ND_PRINT((ndo, "response (service=%d) ",
 374                              EXTRACT_32BITS(&dhr->dccph_resp_service)));
 375                 break;
 376         }
 377         case DCCP_PKT_DATA:
 378                 ND_PRINT((ndo, "data "));
 379                 break;
 380         case DCCP_PKT_ACK: {
 381                 fixed_hdrlen += 8;
 382                 if (len < fixed_hdrlen) {
 383                         ND_PRINT((ndo, "truncated-dccp ack - %u bytes missing!",
 384                                      len - fixed_hdrlen));
 385                         return;
 386                 }
 387                 ND_PRINT((ndo, "ack "));
 388                 break;
 389         }
 390         case DCCP_PKT_DATAACK: {
 391                 fixed_hdrlen += 8;
 392                 if (len < fixed_hdrlen) {
 393                         ND_PRINT((ndo, "truncated-dccp dataack - %u bytes missing!",
 394                                      len - fixed_hdrlen));
 395                         return;
 396                 }
 397                 ND_PRINT((ndo, "dataack "));
 398                 break;
 399         }
 400         case DCCP_PKT_CLOSEREQ:
 401                 fixed_hdrlen += 8;
 402                 if (len < fixed_hdrlen) {
 403                         ND_PRINT((ndo, "truncated-dccp closereq - %u bytes missing!",
 404                                      len - fixed_hdrlen));
 405                         return;
 406                 }
 407                 ND_PRINT((ndo, "closereq "));
 408                 break;
 409         case DCCP_PKT_CLOSE:
 410                 fixed_hdrlen += 8;
 411                 if (len < fixed_hdrlen) {
 412                         ND_PRINT((ndo, "truncated-dccp close - %u bytes missing!",
 413                                      len - fixed_hdrlen));
 414                         return;
 415                 }
 416                 ND_PRINT((ndo, "close "));
 417                 break;
 418         case DCCP_PKT_RESET: {
 419                 struct dccp_hdr_reset *dhr =
 420                         (struct dccp_hdr_reset *)(bp + fixed_hdrlen);
 421                 fixed_hdrlen += 12;
 422                 if (len < fixed_hdrlen) {
 423                         ND_PRINT((ndo, "truncated-dccp reset - %u bytes missing!",
 424                                      len - fixed_hdrlen));
 425                         return;
 426                 }
 427                 ND_TCHECK(*dhr);
 428                 ND_PRINT((ndo, "reset (code=%s) ",
 429                              dccp_reset_code(dhr->dccph_reset_code)));
 430                 break;
 431         }
 432         case DCCP_PKT_SYNC:
 433                 fixed_hdrlen += 8;
 434                 if (len < fixed_hdrlen) {
 435                         ND_PRINT((ndo, "truncated-dccp sync - %u bytes missing!",
 436                                      len - fixed_hdrlen));
 437                         return;
 438                 }
 439                 ND_PRINT((ndo, "sync "));
 440                 break;
 441         case DCCP_PKT_SYNCACK:
 442                 fixed_hdrlen += 8;
 443                 if (len < fixed_hdrlen) {
 444                         ND_PRINT((ndo, "truncated-dccp syncack - %u bytes missing!",
 445                                      len - fixed_hdrlen));
 446                         return;
 447                 }
 448                 ND_PRINT((ndo, "syncack "));
 449                 break;
 450         default:
 451                 ND_PRINT((ndo, "invalid "));
 452                 break;
 453         }
 454
 455         if ((DCCPH_TYPE(dh) != DCCP_PKT_DATA) &&
 456                         (DCCPH_TYPE(dh) != DCCP_PKT_REQUEST))
 457                 dccp_print_ack_no(ndo, bp);
 458
 459         if (ndo->ndo_vflag < 2)
 460                 return;
 461
 462         ND_PRINT((ndo, "seq %" PRIu64, dccp_seqno(bp)));
 463
 464         /* process options */
 465         if (hlen > fixed_hdrlen){
 466                 const u_char *cp;
 467                 u_int optlen;
 468                 cp = bp + fixed_hdrlen;
 469                 ND_PRINT((ndo, " <"));
 470
 471                 hlen -= fixed_hdrlen;
 472                 while(1){
 473                         optlen = dccp_print_option(ndo, cp, hlen);
 474                         if (!optlen)
 475                                 break;
 476                         if (hlen <= optlen)
 477                                 break;
 478                         hlen -= optlen;
 479                         cp += optlen;
 480                         ND_PRINT((ndo, ", "));
 481                 }
 482                 ND_PRINT((ndo, ">"));
 483         }
 484         return;
 485 trunc:
 486         ND_PRINT((ndo, "%s", tstr));
 487         return;
 488 }
 489
 490 static const struct tok dccp_option_values[] = {
 491         { 0, "nop" },
 492         { 1, "mandatory" },
 493         { 2, "slowreceiver" },
 494         { 32, "change_l" },
 495         { 33, "confirm_l" },
 496         { 34, "change_r" },
 497         { 35, "confirm_r" },
 498         { 36, "initcookie" },
 499         { 37, "ndp_count" },
 500         { 38, "ack_vector0" },
 501         { 39, "ack_vector1" },
 502         { 40, "data_dropped" },
 503         { 41, "timestamp" },
 504         { 42, "timestamp_echo" },
 505         { 43, "elapsed_time" },
 506         { 44, "data_checksum" },
 507         { 0, NULL }
 508 };
 509
 510 static int dccp_print_option(netdissect_options *ndo, const u_char *option, u_int hlen)
 511 {
 512         uint8_t optlen, i;
 513
 514         ND_TCHECK(*option);
 515
 516         if (*option >= 32) {
 517                 ND_TCHECK(*(option+1));
 518                 optlen = *(option +1);
 519                 if (optlen < 2) {
 520                         if (*option >= 128)
 521                                 ND_PRINT((ndo, "CCID option %u optlen too short", *option));
 522                         else
 523                                 ND_PRINT((ndo, "%s optlen too short",
 524                                     tok2str(dccp_option_values, "Option %u", *option)));
 525                         return 0;
 526                 }
 527         } else
 528                 optlen = 1;
 529
 530         if (hlen < optlen) {
 531                 if (*option >= 128)
 532                         ND_PRINT((ndo, "CCID option %u optlen goes past header length",
 533                             *option));
 534                 else
 535                         ND_PRINT((ndo, "%s optlen goes past header length",
 536                             tok2str(dccp_option_values, "Option %u", *option)));
 537                 return 0;
 538         }
 539         ND_TCHECK2(*option, optlen);
 540
 541         if (*option >= 128) {
 542                 ND_PRINT((ndo, "CCID option %d", *option));
 543                 switch (optlen) {
 544                         case 4:
 545                                 ND_PRINT((ndo, " %u", EXTRACT_16BITS(option + 2)));
 546                                 break;
 547                         case 6:
 548                                 ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
 549                                 break;
 550                         default:
 551                                 break;
 552                 }
 553         } else {
 554                 ND_PRINT((ndo, "%s", tok2str(dccp_option_values, "Option %u", *option)));
 555                 switch (*option) {
 556                 case 32:
 557                 case 33:
 558                 case 34:
 559                 case 35:
 560                         if (optlen < 3) {
 561                                 ND_PRINT((ndo, " optlen too short"));
 562                                 return optlen;
 563                         }
 564                         if (*(option + 2) < 10){
 565                                 ND_PRINT((ndo, " %s", dccp_feature_nums[*(option + 2)]));
 566                                 for (i = 0; i < optlen - 3; i++)
 567                                         ND_PRINT((ndo, " %d", *(option + 3 + i)));
 568                         }
 569                         break;
 570                 case 36:
 571                         if (optlen > 2) {
 572                                 ND_PRINT((ndo, " 0x"));
 573                                 for (i = 0; i < optlen - 2; i++)
 574                                         ND_PRINT((ndo, "%02x", *(option + 2 + i)));
 575                         }
 576                         break;
 577                 case 37:
 578                         for (i = 0; i < optlen - 2; i++)
 579                                 ND_PRINT((ndo, " %d", *(option + 2 + i)));
 580                         break;
 581                 case 38:
 582                         if (optlen > 2) {
 583                                 ND_PRINT((ndo, " 0x"));
 584                                 for (i = 0; i < optlen - 2; i++)
 585                                         ND_PRINT((ndo, "%02x", *(option + 2 + i)));
 586                         }
 587                         break;
 588                 case 39:
 589                         if (optlen > 2) {
 590                                 ND_PRINT((ndo, " 0x"));
 591                                 for (i = 0; i < optlen - 2; i++)
 592                                         ND_PRINT((ndo, "%02x", *(option + 2 + i)));
 593                         }
 594                         break;
 595                 case 40:
 596                         if (optlen > 2) {
 597                                 ND_PRINT((ndo, " 0x"));
 598                                 for (i = 0; i < optlen - 2; i++)
 599                                         ND_PRINT((ndo, "%02x", *(option + 2 + i)));
 600                         }
 601                         break;
 602                 case 41:
 603                         if (optlen == 4)
 604                                 ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
 605                         else
 606                                 ND_PRINT((ndo, " optlen != 4"));
 607                         break;
 608                 case 42:
 609                         if (optlen == 4)
 610                                 ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
 611                         else
 612                                 ND_PRINT((ndo, " optlen != 4"));
 613                         break;
 614                 case 43:
 615                         if (optlen == 6)
 616                                 ND_PRINT((ndo, " %u", EXTRACT_32BITS(option + 2)));
 617                         else if (optlen == 4)
 618                                 ND_PRINT((ndo, " %u", EXTRACT_16BITS(option + 2)));
 619                         else
 620                                 ND_PRINT((ndo, " optlen != 4 or 6"));
 621                         break;
 622                 case 44:
 623                         if (optlen > 2) {
 624                                 ND_PRINT((ndo, " "));
 625                                 for (i = 0; i < optlen - 2; i++)
 626                                         ND_PRINT((ndo, "%02x", *(option + 2 + i)));
 627                         }
 628                         break;
 629                 }
 630         }
 631
 632         return optlen;
 633 trunc:
 634         ND_PRINT((ndo, "%s", tstr));
 635         return 0;
 636 }